Portable infusion pump



FIG. 1 is a perspective view of a portable infusion pump according to the present invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof the opposite side elevational view being identical thereto; and,

FIG. 4 is a bottom view thereof. 

The ornamental design for a portable infusion pump, as shown and described. 